. >> i would remind you that extremism in the defense of liberty is no vice. (crowd cheers) >> narrator: and when goldwater received the nomination, mitt saw his father angrily storm out. >> i think that my father was always willing to live according to his principles. he didn't shy away from any challenge. he was a very strong person in doing that. and we learned that you have to live up to what you believe in. >> narrator: one thing george romney believed in was the vietnam war. and one year later, when mitt showed up at stanford university, he would adopt his father's position. >> so, he is very much on his father's side for the vietnam war at that time. he is really out of his element where the whole campus is being roiled by this anti-war and anti-establishment protest. >> narrator: mitt took on the protestors. >> mitt romney is a fairly rule-bound person. he actually protested the protestors. he held up a big sign that said, "go back to your studies." >> and we see the mitt romney who cares about rules and institutions and following orders. and that caus